Simple harmonic motion : সরল দোলন;
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Appropriate Prepositions
Bridge over (সেতু): The only entrance to Allahabad in that direction was by a bridge over the Jumna.
Count on/upon (নির্ভর, বিশ্বাস করা): Rahim count on (upon) my help.
Detrimental to (অপকারী): Smoking is detrimental to health.
Refrain from (বিরত রাখা বা থাকা): I refrained him from smoking.
Solution to (সমাধান): None can solution to every problem.
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Idioms
All at once - (হঠাৎ): I feel terribly sleepy all at once.
Bad blood - (শত্রুতা): There has always been bad blood between these families.
Backstairs influence (secret and illegal influence- গোপন এবং বে আইনী প্রভাব-n) He did not deseve the job, however, he got it by backstairs influence.
Through and through (পুঙ্খানুপুঙ্খু রুপে)- He read the poem through and through.
Weal and woe (joy and sorrow, সুখ দঃখ) —Human life is full of weal and woe.